Lightroom: can't import movies only for Sony DSC-RX100

If you shoot one or more movies only on a Sony DSC-RX100, Lightroom won't recognize any content at all in the import dialog.
You have to shoot also at least one picture to import media from the card.

How to reproduce the bug:

1) Format the card
2) Shoot a movie. Lightroom won't recognize anything. Here it is the card content:
3) Shoot even a second movie. Still nothing happens. Here it is the card content:
4) Shoot a single picture. Lightroom now can import both the picture and the two previous clips. Here it is the card content: